End cap for paper cores



END CAP FOR PAPER CORES Filed Nov. 22, 1952 INVENTOR 16 Anmzxe m.

ATTORNEY Patented Oct. 3, I933 UmrEos TAT Es PATENT mm END CAP FOR PAPER CORES Annie L. Beagles, Corinth, N. Y., ass ignor' to Elixman Paper Core 00. Inca Corinth, N. Y., a corporation of New York Application November 22, 1932 Serial No. 643,803

4 Claims. (Cl. 24268) This invention is for a novel end cap for tubular paper cores on which large rolls of paper are wound in the factory for shipment to the consumers. The end cap of my invention is shaped 5 complete from a single piece of sheet metal, and

its novel feature comprises a web having a reinforced polygonal hole for receiving a driving shaft. This hole is reinforced by means of integral flanges bent back and welded to the web,

we thereby forming awall of double thickness. To increase the rigidity of the driving web, the latter is axially displaced along a circle just beyond the outer ends of the flanges, thereby providing an annular strengthening shoulder. The resultant structure is a sheet-metal end cap of light weight and yet possessing ample rigidity as a driving connection; The novel features and practical advantages of my invention will be clear from a description of the following drawing, in which- Fig. 1 represents an axial cross-section through a paper core provided with my new end cap; and

Fig. 2 is a radial cross-section on line 22 of Fig. 1.

The end cap comprises an outer'sleeve 10, an inner sleeve 12. an annular Web 13 connecting the outer ends of the sleeves, and a disk-shaped web 14 projecting from the inner end of the inner sleeve 12. These parts are shaped from a single piece of sheet metal, preferably cold-rolled steel.

The cylindrical sleeves 10 and 12 are spaced to receive the end of a tubular core 15 in a tight fit, and the cap is locked to the core in any practical way, as by being indented at points 16. The web 14 is provided with a central driving hole 17 of non-circular shape, preferably square, and the integral flanges 18 around the hole are bent back flat against the web, thereby forming a strong wall of double thickness. The flanges I8 at those points. In this way the web and flanges are for practical purposes an integral doublewalled unit capable of withstanding the greatest torque that may develop during the driving operation.

In some designs of these end caps, especially in caps of extra-large size, I may still further increase the rigidity of web 14 by off-setting it laterally to form an annular shoulder 21 near the outer ends 22 of the welded flanges 18. This annular shoulder takes up part of the strain when the core is rotated. It is understood, of course, that each end of the core has a cap, although only one cap may be connected to the driving shaft.

are spot-welded at 19, and preferably also at the four corners 20 to prevent tearing of the hole It will be clear from the preceding description that I have provided an end cap which is easy and cheap to make, is light in weight, and has ample strength as a driving connection for the core without danger of twisting or tearing. Although I have shown and described a specific structure, I want it understood that my invention is not limited to the details set forth. Changes and modifications may be made without departing from the scope of the appended claims.

I claim as my invention:

1. An end cap for tubular cores, said cap being shaped from a single piece of sheet metal and comprising a pair of concentric cylindrical sleeves connected at their outer ends by an annular rim, said spaced sleeves being adapted to receive the end of a core and to be secured thereto,an integral disk-like web extending from the inner end of the inner sleeve and having a central polygonal hole adapted to receive a driving member, integral flanges projecting from said web around the hole and bent flat against one face'of the web, and means for permanently holding said flanges flat against the web to form a Wall of double thickness around said hole.

2. An end cap for tubular cores, said cap being shaped from a single piece of sheet metal and comprising a pair of concentric cylindrical sleeves connected at their outer ends by an annular rim, said spaced sleeves being adapted to receive the end of a core and to be secured thereto, an integral disk-like web extending from the inner end of the inner sleeve and having a central polygonal hole adapted to receive a driving member, integral flanges projecting from said web 7 around the hole and bent flat against one face of the web, and means for permanently holding said flanges flat against the web to form a wall of double thickness around said hole, said means including spot-welding of the flanges to the web at the corners of said hole, whereby tearing of said corners is prevented.

3. An end cap for tubular cores, said cap being shaped from a single piece of sheet metal and comprising a pair of concentric cylindrical sleeves connected at their outer ends by an annular rim, said spaced sleeves being adapted to receive the end of a core andto be secured thereto, an integral disk-like web extending from the inner end of the inner sleeve andhaving a 1 5 central polygonal hole adapted to receive a driv ing member, integral flanges projecting from said .web around the hole and bent fiat against one of double thickness around said hole, and an annular oil-set shoulder formed in said web near the outer ends of said flanges, said annular shoulder dividing the web into two concentric sections axially displaced along said shoulder to increase the torque-resisting power of the web.

4. An end cap for tubular cores, said cap being shaped from a single piece of sheet metal and comprising a pair of concentric cylindrical sleeves connected at their outer ends by an annular rim, said spaced sleeves being adapted to receive the end of a core and to be secured thereto, an

integral disk-like web extending from the inner end of the inner sleeve and having a central polygonal hole adapted to receive a driving member, integral flanges projecting from said web 

